What is the relationship between the direction of current and direction of electron flow in a current-carrying wire?
Answers
Explanation :
The direction of current flow is in opposite direction to that of the direction of electron flow.
Electric current is defined as the electric charge per unit time. Simply it is the flow of electrons in a circuit. When an electric potential is applied in a circuit, the current moves from the positive terminal of a battery to the negative terminal.
But the electrons travel from negative to the positive terminal i.e in the direction opposite to that of current flow.
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(1) Kinetic energy decreases and total mechanical energy increases.
(2) Kinetic energy decreases and total mechanical energy remains the same.
(3) Kinetic energy remains the same and total mechanical energy increases.
(4) Kinetic energy remains the same and total mechanical energy remains the same.
Answers
Taking into account the definition of kinetic, potencial and mechanical energy, kinetic energy decreases and total mechanical energy remains the same.
Kinetic energy
Kinetic energy is a form of energy. It is defined as the energy associated with bodies that are in motion and this energy depends on the mass and speed of the body.
Kinetic energy is defined as the amount of work necessary to accelerate a body of a given mass and at rest, until it reaches a given speed. Once this point is reached, the amount of accumulated kinetic energy will remain the same unless there is a change in speed or the body returns to its state of rest by applying a force.
Potential energy
On the other hand, potential energy is the energy that measures the ability of a system to perform work based on its position. In other words, this is the energy that a body has at a certain height above the ground.
Gravitational potential energy is the energy associated with the gravitational force. This will depend on the relative height of an object to some reference point, the mass, and the force of gravity.
Mechanical energy
Finally, mechanical energy is that which a body or a system obtains as a result of the speed of its movement or its specific position, and which is capable of producing mechanical work. Then:
Potential energy + kinetic energy = total mechanical energy
Principle of conservation of mechanical energy
The principle of conservation of mechanical energy indicates that the mechanical energy of a body remains constant when all the forces acting on it are conservative (a force is conservative when the work it does on a body depends only on the initial and final points and not the path taken to get from one to the other.)
Therefore, if the potential energy decreases, the kinetic energy will increase. In the same way, if the kinetics decreases, the potential energy will increase.
This case
The principle of conservation of mechanical energy can be applied in this case. When a block is pulled at constant speed up an incline, the potential energy increases because it increases the height.
Then, if by the principle mentioned above, the total mechanical energy remains the same, the kinetic energy decreases.
In summary, the correct answer is option (2)Kinetic energy decreases and total mechanical energy remains the same.
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Answer:
(2) Kinetic energy remains the same and total mechanical energy increases.
Explanation:
A body has kinetic energy due to its speed. A body has potential energy due its position or configuration. The sum of kinetic energy and potential energy is known as mechanical energy.
As the block is pulled up at constant speed, the kinetic energy remains the same. With increase in the height, the potential energy of the body increases. Thus, due to increase in potential energy, there is increase in the total mechanical energy.
Answers
Clear question is;
An ideal gas is enclosed in a piston-cylinder apparatus with the piston being freely movable. Given that ΔE is positive and ΔH is negative following a process,
pick one
A) the system absorbs heat and expands during the process.
B) the system absorbs heat and contracts during the process.
C) the system loses heat and expands during the process.
D) the system loses heat and contracts during the process.
E) the system loses heat but neither expands nor contracts during the process.
Answer:
Option A is correct.
Explanation:
In thermodynamics, when the change in energy which is ΔE of a system is positive, it means that the system is undergoing an endothermic process. An endothermic process is simply one where heat is absorbed from the surroundings
Now, when change in enthalpy which is ΔH is negative, it means that it's an exothermic reaction. Exothermic means it releases heat to the surroundings. This means work is positive because the system does work on the surroundings. Thus it will expand.
So the correct answer is;
heat is absorbed from the surroundings and will expand during the process.
Answers
Answer:
The mass of the second weight is approximately 0.477 kg
Explanation:
The given parameters are;
The acceleration experienced by the two weights = 3.8 m/s²
The mass of the first weight = 1.08 kg
The formula for the acceleration, a, of weights attached to a friction pulley, is given as follows;
Where;
a = The common acceleration of the two weights
g = The acceleration due to gravity = 9.81 m/s²
M = The mass of the first weight = 1.08 kg
m = The mass of the second weight
Therefore, we have;
The mass of the second weight = m ≈ 0.477 kg
The mass of the second weight ≈ 0.477 kg.
B. The field points out along radial lines from the bar magnet, extending straight out to infinity.
C. The field lines go from the magnet's north pole into its south pole.
D. The field points straight into the bar magnet along radial lines that extend to infinity.
Answers
Option C. The field lines go from the magnet's north pole into its south pole.
The magnetic field lines of a magnet always emerge from its North pole and enter back in the south pole, as shown in the image attached with.
Therefore, option C is the correct answer
Answer:
c
Explanation:
Answers
Both involve the formation of a gas.
Answers
Answer
Electromagnetic energy
Explanation
Sunlight is a radiation. From the electromagnetic spectrum we have visible light and ultraviolet radiation whose source is the sunlight.
All electromagnetic radiation possess some energy given by E=hf.
Since we have seen that sunlight is in the electromagnet spectrum, it is a form of energy which is electromagnetic.
Final answer:
Sunlight is a form of energy called electromagnetic energy
Explanation:
Sunlight is a form of energy that is emitted by the sun as electromagnetic radiation. This radiation exists in different wavelengths, each with its own characteristic energy. The visible light that we can see is just one type of energy emitted from the sun. It is specifically a subset of electromagnetic radiation that includes visible light, ultraviolet (UV) light, and other wavelengths.
It is produced by nuclear fusion in the sun's core and travels to Earth through space. Sunlight is essential for life on Earth, as it provides energy for photosynthesis in plants, regulates climate, and is a primary source of light and heat for our planet.
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